Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Focus Session: Charge Transport at Surfaces and Nanostructures with Multi-probe Techniques I
O 32.6: Vortrag
Dienstag, 21. März 2017, 12:15–12:30, WIL C307
Oxygen adsorption induced tuning of transport in atomic gold chains on vicinal silicion — •Frederik Edler1, Ilio Miccoli1, Jan P. Stöckmann1, Herbert Pfnür1, Christian Braun2, Simone Sanna2, Wolf G. Schmidt2, and Christoph Tegenkamp1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover — 2Lehrstuhl für Theoretische Physik, Universität Paderborn, 33098 Paderborn
Adsorption of Au submonolayer on Si(hhk) surfaces results in growth of long-range ordered quasi one dimensional 1D metallic quantum wires. We present a systematic study on the transport properties of these self-assembled chains of gold atoms on vicinal Si(553) and Si(557) surfaces via a multi-tip STM/SEM system in combination with SPALEED. The transport characteristics of these Au/Si(hhk) systems, i.e. conductivity values along and perpendicular to the chains were carefully analyzed during in-situ adsorption of molecular oxygen. In combination with recent DFT calculations, we discuss the transport in terms of the different structural building blocks (Au chains, Si-adatom chain, Si edge) found for the Au/Si(hhk) systems. It will be shown, that the origin for the metallic surface bands along the wires are of different origin. Therefore, while the Si(553)-Au surface turns out to be rather immune against oxidation, the Si(557)-Au surface reveals a strong decrease of the conductance due to complete destruction of the Si-adatom ordering along the chains.